Johtavuusvyölle

Johtavuusvyölle refers to a geological concept, specifically a layer within the Earth's interior characterized by higher electrical conductivity compared to its surrounding regions. This phenomenon is often studied using magnetotellurics, a geophysical technique that measures naturally occurring electromagnetic fields to infer subsurface electrical properties. Variations in electrical conductivity can be caused by several factors, including the presence of fluids like water and dissolved salts, the type and orientation of rock minerals, and the temperature of the rock.

Geologists and geophysicists identify these conductive layers through anomalies in electromagnetic field measurements. A prominent example is the asthenosphere, the upper layer of the Earth's mantle, below the lithosphere. The asthenosphere is generally considered to be more ductile and has higher temperatures, which can facilitate the movement of ions within its mineral structure, thus increasing its electrical conductivity. Other conductive zones might be associated with hydrothermal systems, sedimentary basins containing saline groundwater, or regions with graphite-rich rocks. Understanding the extent and properties of johtavuusvyölle is crucial for comprehending mantle dynamics, plate tectonics, and the distribution of geothermal resources.